EP3833593A1 - Steering-rack-force optimised steering sensation of a steer-by-wire motor vehicle steering system - Google Patents
Steering-rack-force optimised steering sensation of a steer-by-wire motor vehicle steering systemInfo
- Publication number
- EP3833593A1 EP3833593A1 EP19769010.0A EP19769010A EP3833593A1 EP 3833593 A1 EP3833593 A1 EP 3833593A1 EP 19769010 A EP19769010 A EP 19769010A EP 3833593 A1 EP3833593 A1 EP 3833593A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering
- steering torque
- driver
- rack
- rack force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000035807 sensation Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000008054 signal transmission Effects 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/008—Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications
Definitions
- the present invention relates to a method for adapting a
- the position of the steered wheels is not directly coupled to the steering input means, for example a steering wheel.
- the driver's steering request is picked up by a steering angle sensor and, depending on the driver's steering request, the position of the steered wheels is regulated via a steering actuator.
- a mechanical connection to the wheels is not provided, so that no immediate force feedback is transmitted to the driver after the steering wheel is actuated.
- a correspondingly adapted feedback for example when parking or when driving straight ahead, in which one is adapted to the vehicle reaction, differs depending on the vehicle manufacturer
- Steering torque is desired as force feedback is provided.
- reaction forces act as lateral forces on the steering gear, which the feedback actuator simulates in the form of a torque opposite to the steering direction.
- the driver experiences a steering feeling that can be predetermined thereby.
- the feedback properties of the steering are determined by the rack force that acts on the rack from the tie rods, which are connected to the wheels via the chassis.
- the rack force is significantly influenced by the current cornering forces. A substantial part of the current rack force corresponds to one
- the rack force is not only determined by the lateral forces that occur while driving through a curve, but a number of other variables of a current driving situation have an influence on the rack force.
- An example of this is the
- the currently applied rack force can be determined by means of a torque sensor arranged on the rack or by estimation using a so-called observer based on a model of the steering system.
- a torque sensor arranged on the rack
- observer based on a model of the steering system.
- Such a method is disclosed, for example, in DE 103 320 23 A1.
- the steering torque is determined as a function of the lateral force occurring on steered wheels or as a function of the actual steering torque.
- the known method provides that
- an artificially generated steering torque is currently used to control the feedback actuator. It is very complex to map the road feedback and the steering feeling in and above a dynamic driving range.
- Adaptation of a steering torque for controlling a feedback actuator of a steer-by-wire motor vehicle steering system and a method for controlling a steer-by-wire steering system for motor vehicles which allow a more accurate mapping of a realistic steering feel. Furthermore, a steer-by-wire steering system is to be specified that enables improved steering behavior.
- a method for adapting a steering torque for controlling a feedback actuator of a steer-by-wire motor vehicle steering is provided with the following steps:
- the limit value is preferably formed by forming an uncertainty band around the steering torque based on rack force. It is advantageous if the uncertainty band is symmetrical to the value of the steering torque based on the rack force.
- the uncertainty band is stretched up and down at regular intervals from the basic steering torque. This firmly defined uncertainty band forms like a shell around the basic steering torque.
- the uncertainty band has an upper band limit of 125% of the value based on the toothed rack force
- Gear rack force based on steering torque is 115% of the value of the steering torque based on rack force and the lower band limit is 85% of the value of the steering torque based on rack force.
- the band gap between the two band boundaries of the uncertainty band is preferably at least 20% and at most 60% of the value of the steering torque based on the rack force.
- the basic steering torque is preferably generated from a vehicle speed and a steering angle applied to the steering wheel and is thereby for
- the racking force-based steering torque is preferably determined by means of an estimate of the racking force, the vehicle speed and the measured rack position.
- the rack force is preferably determined using a steering gear model-based estimate. This preferably has a non-linear steering gear model.
- the steering gear model-based estimate is based on rack information, such as the rack position and a torque query, and is independent of roadway information.
- the steering gear model-based estimate can further be expanded to include a vehicle model-based estimate in order to improve the quality of the feedback from the road to the driver and thus the steering feel.
- an estimated steering gear model-based toothed rack force is determined in one unit and an estimated linear vehicle model-based one in another unit
- Rack force in which roadway information is implemented, is determined.
- the values of both rack forces are compared with each other, if necessary adapted to the determined vehicle model-based rack force, and a resulting rack force is determined from this.
- the determined or adapted resulting rack force is then converted into the rack force-based steering torque. The further adjustment of the steering torque is carried out as described above
- the adaptation preferably comprises a scaling of the difference, which is then given as an offset to the basic steering torque. Scaling is preferably carried out in a state when the driver is oversteering or understeering.
- a method for controlling a steer-by-wire steering system for a motor vehicle comprises: an electronically controllable steering actuator acting on the steered wheels,
- a feedback actuator which can be acted upon by a driver with a driver request for a steering angle via a steering input device and which outputs a feedback signal to the steering input device in response to the driver request and a driving state of the motor vehicle
- control unit controls the steering actuator in order to transform the driver's wish into a deflection of the steered wheels
- the feedback signal depending on a
- Steering torque takes place and the steering torque is determined using a previously described method.
- a steer-by-wire steering system for a motor vehicle is also comprehensive:
- a feedback actuator which can be acted upon by a driver with a driver request for a steering angle via a steering input device and which outputs a feedback signal to the steering input device in response to the driver request and a driving state of the motor vehicle
- a device for signal transmission which transmits the driver's request to the control unit, is provided, wherein the control unit controls the steering actuator in order to transform the driver's request into a deflection of the steered wheels, and wherein the steer-by-wire steering system is set up to carry out a previously described method.
- the control unit which has an evaluation unit, executes the method.
- FIG. 1 a schematic representation of a steer-by-wire steering system
- FIG. 2 a block diagram of a control of the steer-by-wire
- FIG. 3 is a block diagram of a module for adapting a
- Figure 4 a time course of a basic steering torque, a steering torque calculated from a rack force and a resulting steering torque, and
- Figure 5 another block diagram of a module for adapting the
- Steering torque which is expanded by a vehicle model.
- a steer-by-wire steering system 1 is shown in FIG.
- a steering angle sensor (not shown) is attached to a steering shaft 2 and detects the driver steering angle applied by turning a steering input means 3, which in the example is designed as a steering wheel. However, a steering torque can also be recorded.
- a joystick can serve as steering input.
- a feedback actuator 4 is attached to the steering shaft 2, which serves to simulate the reactions from the roadway 70 to the steering wheel 3 and thus to give the driver feedback on the steering and driving behavior of the vehicle.
- the driver's steering request is made via the rotation angle a of the steering shaft 2 measured by the rotation angle sensor via signal lines to a feedback actuator monitor unit 10 transmitted, as illustrated in Figure 2.
- the feedback actuator monitor unit 10 transmits the driver's steering request to the control unit 60.
- the feedback actuator monitor unit 10 also preferably controls the feedback actuator 4.
- the feedback actuator monitor unit 10 can also be formed integrally with the control unit 60.
- Control unit 60 controls an electric steering actuator 6, which controls the position of the steered wheels 7, as a function of the signal from the angle of rotation sensor and further input variables.
- the steering actuator 6 acts indirectly on the steered wheels 7 via a steering rack steering gear 8, such as a rack and pinion steering gear, as well as via tie rods 9 and other components.
- FIG. 2 shows a control of the feedback actuator 4.
- the feedback actuator 4 receives signals via a signal line 50, among other things, from the rotation angle sensor, which measures and stores the steering angle ⁇ , the steering angle acceleration and the steering angle speed.
- the feedback actuator 4 communicates with a feedback actuator monitor unit 10, which controls the feedback actuator 4.
- the feedback actuator monitor unit 10 receives the actual wheel steering angle ⁇ of the steered wheels 7 from a control unit 60 of the steering actuator 6, as well as other variables that the
- Control unit 60 has determined.
- the rack position 120 measured on a rack 12 and further roadway information 13 are passed on to the control unit 60.
- the control unit 60 has a module 14 for determining the rack force. Module 14 for
- Determination of the rack force uses a steering gear model-based rack force F r eStrack , which is estimated on the basis of the measured rack position 120 and the steering torque initiated by the driver.
- the determined rack force 14 is used in an evaluation unit 140
- the feedback actuator 4 is controlled in accordance with the resulting steering torque, which thus generates a steering feeling.
- the control unit 60 also receives driver-side steering commands 51, such as the steering angle status.
- the evaluation unit 140 is shown in detail in FIG. On.
- Base steering torque T b is in a unit 30 from the vehicle speed v Veh U nd an applied on the steering wheel steering angle or a steering wheel generates speed and designed for high friction coefficient road, ie it is assumed that the road friction coefficient of the road surface having a high coefficient of friction so as to emulate an electromechanical steering system.
- a high coefficient of friction arises, for example, on dry asphalt, while a medium coefficient of friction arises in snow and a low coefficient of friction occurs in ice.
- a steering feeling resulting from the basic steering torque T b has no discontinuities and is therefore very pleasant for the driver. However, it is very complex to map road feedback (coefficient of friction and the like).
- a steering torque T r based on a toothed rack force is provided.
- This steering torque T r which is based on rack force, is determined in a unit 32 by means of an estimate of the steering gear model-based rack force F r eStrack , the vehicle speed v ; Ve h and the measured rack position s r meas and, if appropriate, further parameters.
- the basic steering torque T is compared according to the invention by the rack-and-pinion steering torque T r and if necessary, especially if oversteer or oversteer
- the basic steering torque T and the steering force T r based on the rack force are compared by forming the difference 15.
- the difference between the two values DT flows into a scaling 16. Since the steering force T r based on the rack force brings certain uncertainties with it, a dynamically generated uncertainty band is placed around the steering force T r based on the rack force.
- the respective value of the steering torque T r formed on the basis of the rack force is reduced by +/- 25%, preferably +/- 15% (lower band limit) or increased (upper
- FIG. 4 shows the course over time of a basic steering torque T b , an associated steering torque T r based on rack force and the resulting steering torque T res .
- the scaling is done as follows:
- the basic steering torque T is within the upper and lower band limits 19, 20 of the uncertainty band of the steering torque T r formed on rack force, the basic steering torque T is not adapted and the resulting steering torque T res corresponds to the basic steering torque T. If, on the other hand, the basic steering torque T lies outside the uncertainty band, this is adapted to the steering torque T r based on the rack force.
- the adjustment is preferably carried out depending on the driving situation
- Scaling the difference between the steering torque T r based on the rack force and the differential torque DT and is then added as an offset to the basic steering torque T, ie by dead band areas on the uncertainty band.
- the complete difference is added, so that the steering feel corresponds exclusively to the modeled rack-and-pinion-based steering torque T r .
- the basic steering torque T is modified accordingly in order to produce a realistic steering feel.
- the resulting steering torque T res flows into the control of the feedback actuator.
- the resulting steering torque T res is therefore the arithmetic steering torque which is intended to counteract the steering torque introduced into the steering wheel by the driver.
- FIG. 5 shows an alternative embodiment of the evaluation unit 140, which is expanded by a linear vehicle model in which roadway information is implemented.
- the basic steering torque T in the unit 30 becomes the vehicle speed v ; Ve h and one on the steering wheel generated steering angle or a steering wheel speed and designed for high-friction roads.
- a steering torque T r based on a toothed rack force is provided.
- the racking force-based steering torque T r is composed of a racking force that results from a linear vehicle model-based estimate of the racking force F r eStvehrack and the steering model-based racking force F r eStrack .
- the vehicle model-based rack force is determined in a unit 28 and the steering gear model-based rack force is determined in a unit 29 from the vehicle speed v Veh and the measured rack position s r meas .
- the determined rack forces are compared in unit 31 and an estimated rack force is formed from both values.
- the steering force T r based on the rack force is formed in the unit 31 from the estimated rack force.
- the resulting steering torque T res is determined as described in FIG. 3.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018119268.1A DE102018119268B4 (en) | 2018-08-08 | 2018-08-08 | Rack force optimized steering feel of a steer-by-wire motor vehicle steering system |
PCT/EP2019/071080 WO2020030621A1 (en) | 2018-08-08 | 2019-08-06 | Steering-rack-force optimised steering sensation of a steer-by-wire motor vehicle steering system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3833593A1 true EP3833593A1 (en) | 2021-06-16 |
EP3833593B1 EP3833593B1 (en) | 2023-06-21 |
Family
ID=67956691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19769010.0A Active EP3833593B1 (en) | 2018-08-08 | 2019-08-06 | Steering-rack-force optimised steering sensation of a steer-by-wire motor vehicle steering system |
Country Status (5)
Country | Link |
---|---|
US (1) | US11807291B2 (en) |
EP (1) | EP3833593B1 (en) |
CN (1) | CN112601691B (en) |
DE (1) | DE102018119268B4 (en) |
WO (1) | WO2020030621A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020133576A1 (en) | 2020-12-15 | 2022-06-15 | Schaeffler Technologies AG & Co. KG | Steering assembly and vehicle and method for determining a steering torque of a steering system |
CN115042858B (en) * | 2022-05-05 | 2024-03-19 | 博世华域转向系统有限公司 | Steering system driver road feel feedback adjustment method based on dynamic rack force |
Family Cites Families (25)
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GB2372020A (en) | 2001-02-07 | 2002-08-14 | Lucas Industries Ltd | Haptic controller for electrically-assisted power steering in road vehicles |
DE10332023A1 (en) * | 2002-07-31 | 2004-02-12 | Daimlerchrysler Ag | Motor vehicle steering method in which the torque to be applied to the steering wheels is determined by a control unit based on a calculated transverse force to be applied to them |
DE50310548D1 (en) * | 2002-07-31 | 2008-11-06 | Daimler Ag | METHOD FOR DETERMINING A STEERING WHEEL TORQUE |
JP3997864B2 (en) * | 2002-08-14 | 2007-10-24 | トヨタ自動車株式会社 | Wheel state acquisition device and vehicle state acquisition device |
JP2005225355A (en) * | 2004-02-12 | 2005-08-25 | Nissan Motor Co Ltd | Steering device for vehicle |
JP4545054B2 (en) * | 2005-06-29 | 2010-09-15 | 株式会社ショーワ | Electric power steering device |
DE102008042666B4 (en) * | 2008-10-08 | 2011-03-17 | Ford Global Technologies, LLC, Dearborn | Method for compensation of disturbances, which act on a vehicle with a power-assisted steering |
DE102009000638A1 (en) | 2009-02-05 | 2010-08-12 | Zf Lenksysteme Gmbh | Determining a desired steering torque in a steering device |
US8150582B2 (en) | 2009-04-20 | 2012-04-03 | Ford Global Technologies, Llc | Systems and methods for decoupling steering rack force disturbances in electric steering |
CN101860305B (en) | 2010-03-31 | 2014-01-22 | 奇瑞汽车股份有限公司 | Method for controlling road sensing motor of line-controlled steering system |
DE102010048991B4 (en) | 2010-10-20 | 2014-09-25 | Audi Ag | Method for setting a return torque |
JP5543906B2 (en) * | 2010-12-22 | 2014-07-09 | 富士重工業株式会社 | Vehicle power steering control device |
JP6004141B1 (en) * | 2014-12-25 | 2016-10-05 | 日本精工株式会社 | Electric power steering device |
JP6090551B2 (en) | 2014-12-25 | 2017-03-15 | 日本精工株式会社 | Electric power steering device |
KR20160092226A (en) * | 2015-01-27 | 2016-08-04 | 현대자동차주식회사 | Feedback control method for an motor-driven power steering using a rack force sensing |
JP6034419B2 (en) * | 2015-02-23 | 2016-11-30 | ボルボ ラストバグナー アーベー | Method and system for assisting a vehicle driver while driving |
CN105083373B (en) | 2015-06-15 | 2017-11-28 | 南京航空航天大学 | A kind of steering-by-wire road feel device and its control method based on parameter Estimation |
DE102015015147A1 (en) | 2015-11-25 | 2017-06-01 | Thyssenkrupp Ag | Feedback actuator for steer-by-wire steering |
US10351167B2 (en) * | 2015-12-09 | 2019-07-16 | Steering Solutions Ip Holding Corporation | Steering system with magnetic torque overlay lash compensation |
DE102016009684A1 (en) | 2016-08-10 | 2018-02-15 | Thyssenkrupp Ag | Control of a steer-by-wire steering system |
JP2020069862A (en) * | 2018-10-30 | 2020-05-07 | 株式会社ジェイテクト | Steering control device |
JP6835301B2 (en) * | 2018-12-14 | 2021-02-24 | 日本精工株式会社 | Electric power steering device |
DE102019105922A1 (en) * | 2019-03-08 | 2020-09-10 | Zf Automotive Germany Gmbh | Method for operating a steering system and steering system |
JP7169957B2 (en) * | 2019-10-03 | 2022-11-11 | 日立Astemo株式会社 | steering controller |
KR20210146496A (en) * | 2020-05-26 | 2021-12-06 | 현대자동차주식회사 | Method and apparatus for limitted steering angle in steer-by-wire system |
-
2018
- 2018-08-08 DE DE102018119268.1A patent/DE102018119268B4/en active Active
-
2019
- 2019-08-06 CN CN201980052589.0A patent/CN112601691B/en active Active
- 2019-08-06 EP EP19769010.0A patent/EP3833593B1/en active Active
- 2019-08-06 US US17/265,234 patent/US11807291B2/en active Active
- 2019-08-06 WO PCT/EP2019/071080 patent/WO2020030621A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE102018119268A1 (en) | 2020-02-13 |
US20210221431A1 (en) | 2021-07-22 |
EP3833593B1 (en) | 2023-06-21 |
CN112601691B (en) | 2023-04-11 |
WO2020030621A1 (en) | 2020-02-13 |
CN112601691A (en) | 2021-04-02 |
DE102018119268B4 (en) | 2020-11-05 |
US11807291B2 (en) | 2023-11-07 |
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